18 F.4th 1333 (2021)

BIOGEN INTERNATIONAL GMBH, Biogen MA, INC., Plaintiffs-Appellants v. MYLAN PHARMACEUTICALS INC., Defendant-Appellee.

United States Court of Appeals, Federal Circuit.

Decided: November 30, 2021.

Attorney(s) appearing for the Case

William F. Lee , Wilmer Cutler Pickering Hale and Dorr LLP, Boston, MA, argued for plaintiffs-appellants. Also represented by Annaleigh E. Curtis , Madeleine C. Laupheimer , Lisa Jon Pirozzolo ; Scott G. Greene , New York, NY; Thomas Saunders , Washington, DC; Paul William Browning , J. Michael Jakes , James B. Monroe , Jason Lee Romrell , Finnegan, Henderson, Farabow, Garrett & Dunner, LLP, Washington, DC.

David Lee Anstaett , Perkins Coie, LLP, Madison, WI, argued for defendant-appellee. Also represented by Andrew Dufresne , Emily Jane Greb ; Dan L. Bagatell , Hanover, NH; Shannon Bloodworth , Nathan K. Kelley , Brandon Michael White , Washington, DC; Matthew Greinert , Mylan, Canonsburg, PA.

Dissenting opinion filed by Circuit Judge O'MALLEY.

This appeal from the United States District Court for the Northern District of West Virginia concerns a patent-infringement dispute between Biogen International GmbH, Biogen MA, Inc., and Mylan Pharmaceuticals, Inc. Biogen owns United States Patent 8,399,514 (the '514 Patent), which claims a method of treating multiple sclerosis...

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